500SL (129.067) V8-5.0L (119.960) (1990)
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Drive Belt: Specifications
On the 190E 2.3L, 420SEL, and 560SEC, SEL & SL models, A/C compressor belt tension is 110 lbs on new belts, and 88-99 lbs. on used belts. On all
other models, the belt tension is maintained by an automatic belt tensioner.